CN104485634B - Realize the power-supply management system and method for average current protection - Google Patents
Realize the power-supply management system and method for average current protection Download PDFInfo
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- CN104485634B CN104485634B CN201410784962.0A CN201410784962A CN104485634B CN 104485634 B CN104485634 B CN 104485634B CN 201410784962 A CN201410784962 A CN 201410784962A CN 104485634 B CN104485634 B CN 104485634B
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Abstract
The present invention provides a kind of power-supply management system for realizing average current protection; including enclosed inside circuit and external circuit; the enclosed inside circuit includes at least comparator, the first logic control circuit, controller, power control circuit, internal output terminal mouth and power input port; the external circuit includes at least load, external sense resistor and output circuit; the comparator is to compare the size of the input voltage of positive input and negative input, so as to produce OC signals and be transmitted to an input terminal of the first logic control circuit of the interval；First logic control circuit is according to received OC signal generations logical signal；The controller according to the logical signal that input terminal receives to output control signals to the power control circuit, so as to fulfill the control of the internal output terminal mouth output voltage.
Description
Technical field
The present invention relates to power management chip, more particularly to a kind of power-supply management system for realizing average current defencive function
And method.
Background technology
Power management chip is conversion, distribution, detection and other electric energy shouldered in electronic apparatus system to electric energy
The chip of the responsibility of management.The application range of wherein power conversion chip is most extensive, including palm PC, camera, reserve battery,
Portable instrument, miniature phone, electromotor velocity control, display biasing and color adjuster etc..Main technology includes：
BOOST structure current-modes loop stability is analyzed, BUCK structure voltage mode loops stability analyses, BUCK structure current-modes
Formula loop stability is analyzed, overcurrent, excess temperature, overvoltage and soft start defencive function, synchronous rectification analysis, reference voltage techniques
Analysis etc..
Overcurrent protection has the function of protection power source load and power supply in itself, is one important in power management chip
Technical indicator.It prevents power supply from generating heat because output current is excessive in itself and finally resulting in and burn out, and is also prevented from load because of power
It is excessive and damage.The design of average current protection can effectively be realized by lacking in the prior art.
The content of the invention
The technical problem to be solved in the present invention is how to realize average current protection.
In order to solve this technical problem, the present invention provides it is a kind of realize average current protection power-supply management system,
Including enclosed inside circuit and external circuit, the enclosed inside circuit includes at least comparator, the first logic control circuit, control
Device, power control circuit, internal output terminal mouth and power input port processed, the external circuit include at least load, exterior inspection
Measuring resistance and output circuit,
From the final Voltage Feedback of output circuit output to the input terminal of the load, the output terminal point of the load
Not Lian Jie an external sense resistor one end and one detection port, and then by it is described detection port be connected to the ratio
Compared with the positive input of device, the other end of the external sense resistor is grounded, and the negative input of the comparator inputs a benchmark
Voltage,
The comparator is to compare the size of the input voltage of positive input and negative input, so as to produce OC letters
Number and be transmitted to an input terminal of first logic control circuit；
First logic control circuit is according to received OC signal generations logical signal；
The controller is electric to output control signals to the power supply control according to the logical signal that input terminal receives
Road, so as to fulfill the control of the internal output terminal mouth output voltage；
The internal output terminal mouth is connected with the power control circuit and the output circuit respectively；
The power control circuit is also connected with power input port；
The package pins of the enclosed inside circuit include at least the internal output terminal mouth, power input port, detection
Port and a grounding leg.
Optionally, the power control circuit includes at least the first power tube, the second power tube, power input port connection
To the drain electrode of first power tube, the source electrode of first power tube is connected with the drain electrode of second power tube, and described
The drain electrode of the source electrode of first power tube and the second power tube is connected to the internal output terminal mouth, the source of second power tube
Pole is grounded, and the grid of first power tube and the second power tube is connected to the output terminal of the controller, the controller
Signal to be received according to input terminal controls the conducting of the first power tube and the second power tube with blocking.
Optionally, the controller includes the second logic control circuit and drive circuit, second logic control circuit
An input terminal connect first logic control circuit, the output terminal of second logic control circuit connects two respectively
The input terminal of the drive circuit, the output terminals of two drive circuits connect the first power tube and the second power tube respectively
Grid.
Optionally, the output circuit includes an inductance, and the input terminal of the inductance connects the internal output terminal mouth.
Optionally, the enclosed inside circuit further includes boostrap circuit and capacitive interface, the input terminal of the boostrap circuit
The power input port is connected, a supply port of the controller connects the output terminal and electricity of the boostrap circuit respectively
Hold interface, the both ends of a capacitance connect the capacitive interface and internal output interface, the envelope of the enclosed inside circuit respectively
Tubulature foot further includes the capacitive interface.
Optionally, the enclosed inside circuit further includes linear voltage regulator, band gap reference, soft starting circuit, mistake
Poor amplifier and adjuster, the external circuit further include divider resistance；
The input terminal connection power input port of the linear voltage regulator, the one of the linear voltage regulator
A output terminal connects an input terminal of the band gap reference, and the output terminal of the band gap reference connects the soft start electricity
The input terminal on road, the output terminal of the soft starting circuit are connected to the positive input of the error amplifier, the final electricity
Pressure feeds back to a partial pressure port through a divider resistance, and then feeds back to the negative input of the error amplifier, described
The output terminal of error amplifier is connected to the input terminal of the adjuster, the output terminal of the adjuster and the one of the controller
A input terminal connection,
The adjuster at least produces duty cycle signals to foundation from the received COMP signals of the error amplifier, into
And the duty cycle signals are inputted to the controller；
The controller also to output control signals to the power control circuit according to the duty cycle signals so that
Realize the control of the internal output terminal mouth output voltage；
The package pins of the enclosed inside circuit further include the partial pressure port.
Optionally, the enclosed inside circuit further includes an inner linear voltage output port, the inner linear voltage
Output port is connected with an output terminal of the linear voltage regulator.
Optionally, the enclosed inside circuit further includes amplifier output port, is connected to the defeated of the error amplifier
Outlet, the external circuit further include a resistance and a capacitance, and one end of the resistance connects the amplifier output port, another
End connects one end of the capacitance, the other end ground connection of the capacitance, and the package pins of the enclosed inside circuit further include described put
Big device output port.
Optionally, the quantity of the divider resistance is two, wherein, the final Voltage Feedback to the first divider resistance one
End, the other end of first divider resistance connects one end of second divider resistance and the partial pressure port respectively, described
The other end ground connection of second divider resistance.
Optionally,
The comparator further to：
Judge whether the voltage detected of positive input input is more than the reference voltage of negative input input
If the judging result of at least one determining device is more than output first kind OC signals to first logic
Control circuit；
First logic control circuit further to：
After persistently receiving first kind OC signals and reaching the default time, corresponding logical signal is exported to the control
Device processed；
The controller turns off the output of the voltage of the internal output terminal mouth according to the logical signal, by another default
After time, then reopen.
Present invention also offers a kind of method for managing power supply for realizing average current protection, electricity provided by the invention is employed
Management system, includes the following steps：
S01：Detect the final voltage；
S02：Whether the voltage that the comparator judges to detect is more than reference voltage；
If the judging result of at least one determining device is more than output first kind OC signals to first logic
Control circuit；
S03：Repeat step S01 and S02, after persistently receiving first kind OC signals and reaching the default time, first
Logic control circuit exports corresponding logical signal to the controller；
S04：The controller turns off the output of the voltage of the internal output terminal mouth according to the logical signal, and process is another
After preset time, then reopen.
The present invention is provided with comparator (comparator) in internal encapsulated circuit, when the voltage detected is not more than base
Quasi- voltage, comparator output voltage OC can be it is low, when more than when, OC can be height.When OC has been subjected to for the load of high interval scale
Flow, at this moment OC signals can be output to the first logic control circuit and produce Current limited Control signal (Hiccup).When OC signals are kept
Hiccup signals are exported afterwards for a period of time for high level to controller, and then control power control circuit, then power-supply system is closed
Then disconnected a period of time is restarting.Non-essential resistance R1 and R2 can be changed in the present invention to realize what two were loaded respectively
Overcurrent protection.It is final to realize average current protection.
Brief description of the drawings
Fig. 1 is the local circuit schematic diagram for the power-supply management system that average current protection is realized in one embodiment of the invention；
Fig. 2 is the work wave that flow control is crossed in one embodiment of the invention；
Fig. 3 is the circuit diagram of enclosed inside circuit in one embodiment of the invention；
Fig. 4 is the circuit diagram of external circuit in one embodiment of the invention；
Fig. 5, Fig. 6 are the pin definitions schematic diagrames in one embodiment of the invention；
Fig. 7, Fig. 8 are the pin definitions schematic diagrames in one embodiment of the invention；
Fig. 9, Figure 10 are the pin definitions schematic diagrames in one embodiment of the invention.
Embodiment
Below with reference to Fig. 1 to Figure 10 to the power-supply management system and method provided by the invention for realizing average current protection
It is described in detail, it is an optional embodiment of the invention, it is believed that those skilled in the art is not changing this hair
In the range of bright spirit and content, it can be modified and be polished.
Please refer to Fig.1, the present invention is the system and method designed under the thinking based on diagram meaning.
Specifically, in the output V of power supply chipoutThere is a load Load in there, wherein the electric current flowed through is Iload.It is negative
Output terminal is carried in the indirect over-current detection resistance R on grounds, so IloadFlow through RsTo ground, VsIt is resistance RsOn voltage Vs=Rs*
Iload。
In VsThere connects a comparator (comparator), and the positive input of comparator is Vs, and negative input is
One reference voltage Vref, so working as RsOn voltage VsLess than VrefWhen, comparator output voltage OC is low, works as VsMore than VrefWhen,
OC is height.When OC loads overcurrent for high interval scale, at this moment OC signals can be output to the first logic control circuit, this first
Logic control circuit can be that delay control circuit (delay logic) produces Current limited Control signal (Hiccup).Delays time to control
Circuit refers to export hiccup signals after OC signals remain high level for a period of time to power control circuit, then power supply system
Then system shut-off a period of time is restarting.Specific works waveform is as shown in Figure 2.The value that Rs can be changed is corresponding to set
Overcurrent size (Ilimit), i.e. Ilimit=Vref/Rs.As load current IloadMore than IlimitWhen, load overcurrent.
As load current IloadDuring increase, VsVoltage also increases, when more than VrefDuring voltage, comparator output voltage OC becomes
Height, when OC signals maintain a period of time t1Afterwards, hiccup logic export hiccup logical signals, are then powered off a period of time t2,
Subsequently system reboot.If after restarting and overcurrent occurs, system turns off again, so repeatedly.If overcurrent is not occurring, it is
System is no longer turned off and restarted.
On this basis, please refer to Fig.3 and Fig. 4：
Present embodiments provide a kind of power-supply management system for realizing average current protection, including enclosed inside circuit with it is outer
Portion's circuit, the enclosed inside circuit include at least comparator, the first logic control circuit, controller, power control circuit, interior
Portion output port SW and power input port Vin, power supply are inputted from the power input port, and the external circuit includes at least negative
Carry, external sense resistor and output circuit, in the present embodiment, please refer to Fig.3 and Fig. 4, load, external sense resistor and the ratio
Quantity compared with device is two,
Please refer to Fig.3 and Fig. 4, from the final voltage V of output circuit outputoutFeed back to the load load1 and
The input terminal of load2, the output terminal of the load connect one end and a detection port of an external sense resistor respectively,
In the present embodiment, the output terminal for loading load1 connects external sense resistor R respectively2One end and one detection port Vs1, bear
The output terminal for carrying load2 connects external sense resistor R respectively1One end and a detection port Vs1, and then pass through the detection
Port Vs1 and Vs1 are connected to the positive input of two comparators, external sense resistor R1And R2The other end ground connection,
The negative input of two comparators inputs a reference voltage Vref,
The comparator is to compare the size of the input voltage of positive input and negative input, so as to produce OC letters
Number and be transmitted to an input terminal of first logic control circuit；
First logic control circuit is according to received OC signal generations logical signal；In the present embodiment, that is, export
Hiccup signals；
The controller is electric to output control signals to the power supply control according to the logical signal that input terminal receives
Road, so as to fulfill the control of the internal output terminal mouth output voltage；The specific device of the control signal and power control circuit
It is related；Certainly, the effect of controller and this is not only terminated in.
The internal output terminal mouth SW is connected with the power control circuit and the output circuit respectively；
The power control circuit is also connected with power input port VIN.
The package pins of the enclosed inside circuit include at least the internal output terminal mouth SW, power input port VIN,
Detect port Vs1, Vs2 and a grounding leg GND.
The thinking illustrated with reference to Fig. 1：
The comparator further to：
Judge whether the voltage detected of positive input input is more than the reference voltage of negative input input；
If the judging result of at least one determining device is more than output first kind OC signals to first logic
Control circuit；
First logic control circuit further to：
After persistently receiving first kind OC signals and reaching the default time, corresponding logical signal is exported to the control
Device processed；
The controller turns off the output of the voltage of the internal output terminal mouth SW according to the logical signal, by another pre-
If after the time, then reopen.
The power control circuit includes at least the first power tube M1, the second power tube M2, and power input port is connected to
The drain electrode of the first power tube M1, the source electrode of the first power tube M1 are connected with the drain electrode of the second power tube M2, and
The drain electrode of the source electrode and the second power tube M2 of the first power tube M1 is connected to the internal output terminal mouth, second work(
The grid of the source electrode ground connection of rate pipe M2, the first power tube M1 and the second power tube M2 are connected to the output of the controller
End, the controller to the conducting of signal control the first power tube M1 and the second power tube M2 that receives according to input terminal with
Block.
In the present embodiment, the controller includes the second logic control circuit (not shown) (control logic) and drives
Dynamic circuit (not shown) (driver), an input terminal of second logic control circuit connect the first logic control electricity
Road, the output terminal of second logic control circuit connect the input terminal of two drive circuits, two drivings respectively
The output terminal of circuit connects the grid of the first power tube and the second power tube respectively.
Please refer to Fig.4, the input terminal that the output circuit includes inductance a L, the inductance L connects the internal output terminal
Mouth SW.
Please refer to Fig.3 and Fig. 4, the enclosed inside circuit further include boostrap circuit, also referred to as " Boot charge " and
Capacitive interface BST, the input terminal of the boostrap circuit connect the power input port VIN, a power supply of the controller
Port connects the output terminal and capacitive interface of the boostrap circuit respectively, and the both ends of a capacitance Cb connect the capacitance and connect respectively
Mouth BST further includes the capacitive interface BST with internal output interface SW, the package pins of the enclosed inside circuit.
In the present embodiment, the enclosed inside circuit further includes linear voltage regulator (Internal
Regulator), band gap reference (Bandgap), soft starting circuit (Softstart), error amplifier (Error
Amplifier) and adjuster (Modulator), the external circuit further include divider resistance；
The input terminal of the linear voltage regulator connects the power input port VIN, the linear voltage regulator
An output terminal connect an input terminal of the band gap reference, the output terminal connection of the band gap reference is described soft to open
The input terminal of dynamic circuit, the output terminal of the soft starting circuit are connected to the positive input of the error amplifier, it is described most
Whole voltage is through a divider resistance RaA partial pressure port FB is fed back to, and then feeds back to the negative sense input of the error amplifier
End, the output terminal of the error amplifier are connected to the input terminal of the adjuster, output terminal and the control of the adjuster
The input terminal connection of device processed,
The adjuster at least produces duty cycle signals to foundation from the received COMP signals of the error amplifier, into
And the duty cycle signals are inputted to the controller；
The controller also to output control signals to the power control circuit according to the duty cycle signals so that
Realize the control of the internal output terminal mouth output voltage.
The package pins of the enclosed inside circuit further include the partial pressure port FB.
The enclosed inside circuit further includes an inner linear voltage output port VCC, the inner linear voltage output
Port VCC is connected with an output terminal of the linear voltage regulator.Other outputs for the linear voltage regulator
End, can also connect other devices to realize the power supply of DC voltage.
The enclosed inside circuit further includes amplifier output port COMP, is connected to the output of the error amplifier
End, the external circuit further include a resistance RcWith a capacitance Cc, resistance RcOne end connect the amplifier output port
COMP, the other end connect capacitance CcOne end, capacitance CcThe other end ground connection.The package pins of the enclosed inside circuit
Further include the amplifier output port COMP.
The quantity of the divider resistance is two, wherein, the final voltage VoutFeed back to the first divider resistance RaOne
End, the first divider resistance RaThe other end connect the second divider resistance R respectivelybOne end and the partial pressure port FB,
The second divider resistance RbThe other end ground connection.
Similar to system mentioned above, the present embodiment additionally provides a kind of power management for realizing average current protection
Method, employs the power-supply management system of the present embodiment Fig. 3 and Fig. 4 signal, includes the following steps：
S01：Detect the final voltage；
S02：The comparator judges the voltage V detectedsWhether reference voltage V is more thanref；
If the judging result of at least one determining device is more than output first kind OC signals to first logic
Control circuit；
S03：Repeat step S01 and S02, after persistently receiving first kind OC signals and reaching the default time, first
Logic control circuit exports corresponding logical signal to the controller；
S04：The controller turns off the output of the voltage of the internal output terminal mouth according to the logical signal, and process is another
After preset time, then reopen.
In addition, in the embodiment shown in Fig. 3, Vs1And Vs2What is accessed is the input voltage of external sense resistor.When appoint
When what occurs to export OC1 or OC2 during overcurrent all the way, hiccup signals, control switch-off power pipe M1 and M2 are then exported.Such as Fig. 4
Shown, Vs1 and Vs2 loads load1 and load2 are produced on external sense resistor R1 and R2.VIN accesses are chips
Supply voltage, GND are the ground terminals of chip.What VCC connect is the output of inner linear voltage regulator, can external capacitor or inscribed electricity
Hold band gap reference to be powered by VCC, produce reference voltage Vref。
In embodiment as shown in Figure 3, what FB connect is the partial pressure of output voltage, the negative end of error originated from input amplifier.Vss
It is the output voltage of soft start softstart, the forward end of error originated from input amplifier.As shown in figure 4, FB access voltage be by
Divider resistance RaAnd RbFrom VoutWhat partial pressure produced.As shown in figure 3, COMP is the output terminal of error amplifier, connect compensation resistance and
Capacitance, can be external also built-in for the loop compensation of power conversion chip.COMP signals input regulator (modulator),
Can be current-mode or voltage mode adjuster.Adjuster produces duty cycle signals D and enters controller, then controls power tube
M1 and M2.Wherein, power tube M2 can be replaced with Schottky tube.What SW connect is the source of M1 and the drain terminal of M2.The external bootstrappings of BST
Capacitance Cb, as shown in figure 4, for driving M1 to manage, boostrap circuit, or boot charge circuits by VIN come to bootstrap capacitor
Power supply.
EN interfaces shown in Fig. 3 enable chip by an enabled module (enable), and when EN is low, chip closes
Disconnected, when EN is high, chip is opened.Can outer signal, can also internal fixation put height.
On the basis of system above, many embodiments of the present invention provide following several packing forms：
On packing forms 1, Fig. 5 and Fig. 6 are refer to,
Based on the framework of average current limitation, the pin function encapsulated using SOIC8 or SOIC8-EP is defined.(not office
It is limited to the arrangement of the pin shown in figure) draw high inside EN, chip is constantly in enabled state, inner linear voltage regulator
Export built in the capacitance on VCC.
BST：The bootstrap voltage mode foot for needing to produce for the internal N-type power tube of driving.
VIN：Chip power supply foot, there is provided to internal power pipe and other circuits.
Vs1：Over-current signal test side, when the voltage on Vs1 feet is higher than internal a certain reference voltage, when chip turns off one section
Between.
Vs2：Over-current signal test side, when the voltage on Vs2 feet is higher than internal a certain reference voltage, when chip turns off one section
Between.
FB：Output voltage feedback end, is produced by Vout voltage by divider resistance Ra and Rb.
COMP：Control loop compensating end, ensures loop stability work.
GND：Chip lower margin.
SW：Power tube output pin, when high side power pipe turns on, SW is close to VIN, when low side power pipe turns on, SW
Close to GND.
On packing forms 2, Fig. 7 and Fig. 8 refer to：In packing forms 1, the compensation resistance and capacitance of wherein COMP can
It is built-in, drawn high inside EN, chip is constantly in enabled state, and in the external electricity of output voltage VCC of internal linear regulator
Hold C1, so that VCC voltages are more stable.(being not limited to the pin arrangement shown in figure)
BST：The bootstrap voltage mode foot for needing to produce for the internal N-type power tube of driving.
VIN：Chip power supply foot, there is provided to internal power pipe and other circuits.
Vs1：Over-current signal test side, when the voltage on Vs1 feet is higher than internal a certain reference voltage, when chip turns off one section
Between.
Vs2：Over-current signal test side, when the voltage on Vs2 feet is higher than internal a certain reference voltage, when chip turns off one section
Between.
FB：Output voltage feedback end, is produced by Vout voltage by divider resistance Ra and Rb.
VCC：Inner linear voltage regulator output, external capacitor, so that VCC is more stable.
GND：Chip lower margin.
SW：Power tube output pin, when high side power pipe turns on, SW is close to VIN, when low side power pipe turns on, SW
Close to GND.
On packing forms 3, Fig. 9 and Figure 10 are refer to, in packing forms 1, the compensation resistance and capacitance of wherein COMP
Can be built-in, inner linear conditioner outlet end VCCCapacitance it is also built-in, it is and chip enable signal EN is external, when EN for it is low when core
Piece turns off, and when EN is high, chip is opened.(being not limited to the pin arrangement shown in figure)
BST：The bootstrap voltage mode foot for needing to produce for the internal N-type power tube of driving.
VIN：Chip power supply foot, there is provided to internal power pipe and other circuits.
Vs1：Over-current signal test side, when the voltage on Vs1 feet is higher than internal a certain reference voltage, when chip turns off one section
Between.
Vs2：Over-current signal test side, when the voltage on Vs2 feet is higher than internal a certain reference voltage, when chip turns off one section
Between.
FB：Output voltage feedback end, is produced by Vout voltage by divider resistance Ra and Rb.
EN：Chip Enable Pin, when EN is low, chip turns off, when EN is that high chip is opened.
GND：Chip lower margin.
SW：Power tube output pin, when high side power pipe turns on, SW is close to VIN, when low side power pipe turns on, SW
Close to GND.
In conclusion the present invention is provided with comparator (comparator) in internal encapsulated circuit, when the electricity detected
Pressure be not more than reference voltage, comparator output voltage OC can be it is low, when more than when, OC can be high.When OC is high interval scale
Overcurrent is loaded, at this moment OC signals can be output to the first logic control circuit and produce Current limited Control signal (Hiccup).When
OC signals remain high level and export hiccup signals afterwards for a period of time to controller, and then control power control circuit, then
Then power-supply system shut-off a period of time is restarting.Non-essential resistance R1 and R2 can be changed in the present invention to realize respectively pair
The overcurrent protection of two loads.It is final to realize average current protection.
Claims (10)
- A kind of 1. power-supply management system for realizing average current protection, it is characterised in that：Including enclosed inside circuit and external electrical Road, the enclosed inside circuit are defeated including at least comparator, the first logic control circuit, controller, power control circuit, inside Exit port and power input port, the external circuit include at least load, external sense resistor and output circuit,Connect respectively from the final Voltage Feedback that the output circuit exports to the input terminal of the load, the output terminal of the load One end and a detection port of an external sense resistor are connect, and then the comparator is connected to by the detection port Positive input, the other end ground connection of the external sense resistor, the negative input of the comparator inputs a reference voltage,The comparator is to compare the size of the input voltage of positive input and negative input, so as to produce OC signals simultaneously It is transmitted to an input terminal of first logic control circuit；First logic control circuit is according to received OC signal generations logical signal；The controller outputs control signals to the power control circuit to the logical signal that foundation input terminal receives, from And realize the control of the internal output terminal mouth output voltage；The internal output terminal mouth is connected with the power control circuit and the output circuit respectively；The power control circuit is also connected with power input port；The package pins of the enclosed inside circuit include at least the internal output terminal mouth, power input port, detection port With a grounding leg；The enclosed inside circuit further includes linear voltage regulator, band gap reference, soft starting circuit, error amplifier and tune Device is saved, the external circuit further includes divider resistance；The input terminal of the linear voltage regulator connects the power input port, and one of the linear voltage regulator is defeated Outlet connects an input terminal of the band gap reference, and the output terminal of the band gap reference connects the soft starting circuit Input terminal, the output terminal of the soft starting circuit are connected to the positive input of the error amplifier, the final voltage warp One divider resistance feeds back to a partial pressure port, and then feeds back to the negative input of the error amplifier, the error The output terminal of amplifier is connected to the input terminal of the adjuster, and one of the output terminal of the adjuster and the controller is defeated Enter end connection,The adjuster according to from the received COMP signals of the error amplifier at least to produce duty cycle signals, and then will The duty cycle signals are inputted to the controller；The controller also to output control signals to the power control circuit according to the duty cycle signals, so as to fulfill The control of the internal output terminal mouth output voltage；The package pins of the enclosed inside circuit further include the partial pressure port；The quantity of the load, external sense resistor and comparator is two.
- 2. the power-supply management system as claimed in claim 1 for realizing average current protection, it is characterised in that：The power supply control Circuit includes at least the first power tube, the second power tube, and power input port is connected to the drain electrode of first power tube, described The source electrode of first power tube is connected with the drain electrode of second power tube, and the source electrode and the second power tube of first power tube Drain electrode be connected to the internal output terminal mouth, the source electrode ground connection of second power tube, first power tube and second The grid of power tube is connected to the output terminal of the controller, the signal control that the controller receives to foundation input terminal The conducting of the first power tube and the second power tube is made with blocking.
- 3. the power-supply management system as claimed in claim 2 for realizing average current protection, it is characterised in that：The controller bag The second logic control circuit and drive circuit are included, an input terminal of second logic control circuit connects first logic Control circuit, the output terminal of second logic control circuit connect the input terminal of two drive circuits, two institutes respectively The output terminal for stating drive circuit connects the grid of the first power tube and the second power tube respectively.
- 4. the power-supply management system as claimed in claim 2 for realizing average current protection, it is characterised in that：The output circuit Including an inductance, the input terminal of the inductance connects the internal output terminal mouth.
- 5. the power-supply management system as claimed in claim 1 for realizing average current protection, it is characterised in that：The enclosed inside Circuit further includes boostrap circuit and capacitive interface, and the input terminal of the boostrap circuit connects the power input port, the control One supply port of device processed connects the output terminal and capacitive interface of the boostrap circuit respectively, and the both ends of a capacitance connect respectively The capacitive interface and internal output interface are connect, the package pins of the enclosed inside circuit further include the capacitive interface.
- 6. the power-supply management system as claimed in claim 1 for realizing average current protection, it is characterised in that：The enclosed inside Circuit further includes an inner linear voltage output port, the inner linear voltage output port and the linear voltage regulator An output terminal connection.
- 7. the power-supply management system as claimed in claim 1 for realizing average current protection, it is characterised in that：The enclosed inside Circuit further includes amplifier output port, is connected to the output terminal of the error amplifier, and the external circuit further includes an electricity Resistance and a capacitance, one end of the resistance connect the amplifier output port, and the other end connects one end of the capacitance, the capacitance The other end is grounded, and the package pins of the enclosed inside circuit further include the amplifier output port.
- 8. the power-supply management system as claimed in claim 1 for realizing average current protection, it is characterised in that：The divider resistance Quantity be two, wherein, the final Voltage Feedback to first divider resistance one end, the other end of first divider resistance One end of the second divider resistance and the partial pressure port are connected respectively, and the other end of second divider resistance is grounded.
- 9. the power-supply management system as claimed in claim 1 for realizing average current protection, it is characterised in that：The comparator into One step to：Judge whether the voltage detected of positive input input is more than the reference voltage of negative input inputIf the judging result of at least one comparator is more than output first kind OC signals to first logic control Circuit；First logic control circuit further to：After persistently receiving first kind OC signals and reaching the default time, corresponding logical signal is exported to the control Device；The controller turns off the output of the voltage of the internal output terminal mouth according to the logical signal, by another preset time Afterwards, then reopen.
- A kind of 10. method for managing power supply for realizing average current protection, it is characterised in that：Employ as claim 1 to 8 is any One of described in power-supply management system, include the following steps：S01：Detect the final voltage；S02：Whether the voltage that the comparator judges to detect is more than reference voltage；If the judging result of at least one comparator is more than output first kind OC signals to first logic control Circuit；S03：Repeat step S01 and S02, after persistently receiving first kind OC signals and reaching the default time, the first logic The corresponding logical signal of control circuit output is to the controller；S04：The controller turns off the output of the voltage of the internal output terminal mouth according to the logical signal, by another default After time, then reopen.
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